Stitch regulating and reversing mechanism for sewing machines



May 13, 1947. M. G. IVANDICK STITCH REGULATING AND REVERSING MECHANISM FOR SEWING MACHINES Filed July 20, 1944 '2 Sheets-Sheet l May 13, 1947. M. G. IVANDICK STITCH REGULATING AND REVERSING MECHANISM FOR SEWING MACHINES FiledJL 11y2Q 1944 r 2 Sheets-Sheet 2 A i m,

Patented May 13, 1947 UNITED STATES PATENT OFFICE STITCH REGULATING AND REVERSING MECHANISM FOR SEWING MACHINES Matthew G. Ivandick, Rockford, Ill., assignor to Free Sewing Machine 00., Rockford, 111., a corporation of Illinois 15 Claims.

This invention relates to a new and improved stitch regulating and reversing mechanism for sewing machines.

Sewing machines have been equipped with stitch regulating mechanisms with which reverse sewing could be obtained by the turning of a diametrically slotted cross-head or cam, forming a part of the mechanism, in the opposite direction from a neutral position. However, in some instances, the cross-head was located up in the column, more or less remote from the cloth feed dogs, and that necessitated the use of too much intermediate linkage for transmitting movement to the rocker shaft actuating the dogs, and where that objection was eliminated by having the crosshead below the cloth plate, in closer proximity to the cloth feed dogs, there was invariably the objection of a too complicated and bulky assembly of parts for transmitting movement to the cloth feed dogs. Furthermore, in most, if not all, of the prior constructions, the dog operating means invariably produced dog movements along lines inclined with respect to the cloth plate and with some appreciable variation in rise of the dogs for different stitch adjustments, thereb tending to pucker the goods and even damage some of the more delicate fabrics, not to mention the likelihood of variation in stitch length due to the direction of dog movement. It is, therefore, the principal object of my invention to provide a mechanism of the kind mentioned, which is of relatively simple and compact construction, having the adjustable diametrically slotted crosshead in the closest practicable proximity with the cloth feed dogs, so thatvery 1ittle intermediate linkage is required to transmit movement to the dogs, the said linkage involving a quadrilateral parallelogram-like arrangement of rocker arms adapted to give the cloth feed dogs movement substantially parallel to the cloth plate and always with the'same rise regardless of the stitch regulation for forward or reverse Sewing.

In the mechanism of my invention, the lower rotary hook shaft has two eccentrics on it, one operating in a link that carries the pin slidable in the diametrical slot in the adjustable crosshead and arranged to transmit movement to the cloth feed dogs in accordance with the adjustment of said cross-head, and the other operating in a slot in a plate on which the cloth feed dogs are carried, the plate being slidably mounted at its opposite ends on the parallel rocker arms by pin and slot connections, which permit a uniform vertical movement of the dogs with the plate as determined by the eccentric and back and forth movement of greater or less extent, depending upon the adjustment of the cross-head.

In connection with the mechanism above described, I have provided a novel regulating means connected with the adjustable cross-head by means of a shaft extending from the cross-head to the base of the column in which the regulating means is provided. The regulating means includes a manually operable bell crank lever having a pointer thereon movable with respect to a scale graduated in stitches per inch. The bell crank lever is normally urged in one direction by spring action, and a, keeper plate having a V-notch therein to cooperate with a stop pin on the bell crank lever is arranged to be set to hold the bell crank lever in a selected position of adjustment by abutment with the stoppin in the V-notch. The V-notch in the keeper plate is symmetrical with the scale of stitch graduations, so that when the operator has made a setting for so man stitches per inch in forward sewing, she may obtain the same number of stitches per inch in reverse sewing by simply moving the bell crank lever against spring action to the opposite side of the neutral point.

The invention is illustrated in the accompanying drawings, in which- Fig. 1 is a view partly in front elevation and partly in vertical section of a sewing machine embodying my invention;

Fig. 2 is a vertical cross-section on the line 2-2 of Fig. 1;

Fig. 3 is a sectional detail in the plane of the line 33 of Fig. 2, and

Figs. 4, 5, 6, and 7 are enlarged sectional details taken in the plane of the line 4-4 of Fig. 1, Figs. 4 and 5 showing the cross-head set for forward sewing and Figs. 6 and '1 showing the cross-head set for reverse sewing.

The same reference numerals are applied to corresponding parts throughout the views.

In the drawings, the reference numeral 8 designates the cloth plate, 9 the column projecting upwardly therefrom, and It] the arm from which the needle bar H carrying the needle l2 extends for operation in the usual way. The presser bar 13 appears in Figs. 4 to 7 behind the needle bar II, and carries the usual presser foot M, which is held down in contact with the cloth plate 8 under spring pressure, in the usual way, but may be raised to an out-of-the-way position in the well known manner to permit entry or removal of work. I 5 are the usual cloth feed dogs operable through slots IS in the cloth plate under the presser foot, and I1 is the rotary hook,

0 comprising a thread loop carrier supporting for relative rotational movement a bobbin case base, which, in turn, rotatably supports a bobbin retained in the base by a case, in the well known manner, as illustrated, for example, in the Southam and Wainright Patent No. 2,065,349. The rotary hook I! is turned by means of a shaft l3 supported in bearings under the cloth plate and connected by gears IS with a vertical shaft 20 in the column to operate in timed relation with the upper shaft in the arm I0 (not shown), suitable drive means being provided, as indicated by the motor driven drive pulley d engaging the hand wheel 2| in Fig. 1, to operate'the machine in the usual way, and said hand wheel 2| being operatively connected with one of the gear l6 by another gear 22 to permit manual operation of the machine in the usual way. The structure'thus far described is all old and no invention is claimed therein excepting only insofar as parts thereof cooperate with the 'parts provided in accordance with my invention.

The stitch regulating and reversing cam or cross-head is indicated by the reference numeral 23;directly beneath and in'close proximity to the rotary hook I'l'and carried on the end of a horizonta1'shaft'24 received in bearings under the cloth plate; the shaft 24 being preferably directly beneath the rotary hookoperating shaft l8, as shown.

The cross-he'ad'23 has a diametrically extending slot '25 in the outer face thereof, in which afpin26 is slidable. This pin is carried on the lower endof an' arm*2l, the upper end of which has-"a circular hole 28 therein, rotatably receiving aneccentric 29, that is keyed, as shown at 36, onthe end portion ofthe shaft l8, behind the rotary hook ll. Another eccentric 3|, is also keyed, as at 36, on'the shaft [3, next to the eccentrici fand is slidable and rotatable in an elongated opening '32,'provided in a carrier plate 3'3,"on which the cloth feed, dogs are mounted, as indicated 'at'34 in Fig. 1. The plate 33 has vertical slots 35, provided in its opposite end portions, and there are two parallel spaced arms 36 and 31 pivotally supported "at33 and 39 on downwardly extending .supports 43,, provided thereforunder the cloth plate 8, which have pins 4|, slidably received in the slots 35. The arm 36'has a lower'extension 42, pivotally connected, as at 43, with a link 44, which in turn is pivotally connected with the arm 21, by means of the pin 26. The arms 36 and .31, due to the link connection'44, will duplicate the oscillatory movement of the arm 27, nd will give reciprocatory movement 'to the plate 33 and dogs l5. Now, due to the fact that the eccentric 3l has a fixed throw, it follows that the plate 33 in its horizontal ,reciprocatory'movement will be given the same vertical reciprocation regardless of the adjusted angularity of the cross-head 23, and, of course; regardless of the direction of such adjustment.

In operation, when the cross-head 23 is turned to a position in'which the slot 25 is substantially vertical, there is substantially no oscillatory movement transmitted to the arms 36 and 31, but the plate 33 will nevertheless move up and down in timed relation with the rotation of the eccentric'3l with the shaft 18. In sewing forwardly, the cross-head 23 is turned so that the slot 25 is inclined in the direction shown in Figs. 4 and 5. Under these conditions, the dogs l5 are given an upward and forward cloth feed motion, as the pin 26 moves upwardly in the slot 25, causing counter-clockwise movement of the arms 36 and 31 about their pivots 38 and 36. In reverse sewing, the cross-head 23 is turned so as to give opposite inclination to the slot 25, as shown in Figs. 6 and '7, and under those conditions, it is clear that the cloth feed dogs l5 are given an upward and rearward-movement, as the pin 26 move upwardly in the slot 25, and causes clockwise movements of the arms 36 and 31, with respect to their pivots 38 and 39. It should be clear that regardless of what adjustment is made of the cross-head 23, either for direction of sewing, or for length of stitch, the dogs l5 are given the same up and down motion. Furthermore, the dogs l5 are always moved, when in contact with the goods, along lines substantially parallel to the cloth plate 8, by virtue of the quadrilateral parallelogram-like arrangement of the rocker arms 36 and 3'! relative to the plate 33. It is this highly desirable combination of dog movements that accounts for the freedom in the operation of the present structure from theobjectionpresent in so many earlier constructions of a tendency to pucker the goods, and even damage some of the more'delicate fabrics. With the present construction, there is also nolikelihood-of any variation in stitch length, by virtue of the fact that the dogs, when in contact with the goods, always move substantially parallel to the cloth plate, and are always given the samerise, regardless of the stitch adjustment, and whether it is in forward or reverse sewing. The construction, as should be clear from a-studyof Fig. 1, is so compact that it can be housed easily under the cloth plate, behind the rotary hook l7. As a result, an appreciable saving in cost and weight is realized. There are no problems presented by reason of this mechanism, whichimpose a limitation upon the design of therest of the machine; the machine can be constructed along more compact lines with my invention than was possible with most other prior'constructions.

The cross-head23is arranged to'be adjusted by oscillation of a bell-crank lever 45, which is pivoted as at 45, on the lower portion'of column 9, and has the arm ill-thereof pivo'tally'connected inside the column by means of a pin 48 with the upper end of a link-56, which; extends downwardly from the column into the base 5! and is pivotally connected at its lower end, as at to an arm '53 provided on th e inner end of the shaft 23. The other arm'54 of the bell-crank lever 45 has a pointer 55thereon, which-is'movable relative to a scale 56 that is'gra'duated in terms of the number of stitches perinch which the machine is adapted'tdsew when the lever 35 is setwith the pointer indicating a'specified number of stitches per inch on the scale. The left hand half of the scale 56is lettered F. and the right hand half is lettered R,"to designate forward and reverse sewing, respectively, and the mid-point'of the scale is'markcd O, because that is the neutral point corresponding to vertical-disposition of the slot 25 in' the-crosshead 23, It'will be noticedthat the scale graduations institches-per inch read the same in both directions from the zero'point in increments 'of five stitches per inch. With the present invention, as will soon appear, when the operator has set the lever 45 for 15 stitches per 3 inch, as shown in Fig. 1, forforward sewing, she may at any time move the'lever45 to the right; as-indicated in dotted lines in Fig. 1,-and-sewin the reverse direction with --the same number of stitches per inch. That is to say, there is included in the mechanism provided in accordance with my invention, a stop or keeper plate 51 having a V-notch 58 in which a stop pin 59, projecting from the knob portion 60 of the lever 45, is movable through a shorter or longer dis tance, depending upon the vertical adjustment of the plate 51, with respect to the pin 59. Inasmuch as the mid-point 6| of the notch 58 is in the same vertical plane with the zero point of the scale 55, it follows that the movement of the lever 45 permissible in either direction from the mid-point is the same for any given setting of the plate 57. Consequently, when the operator has set the machine for stitches per inch in forward sewing, as indicated in full lines in Fig. 1, she can, at will, sew in reverse with the same number of stitches per inch by movement of the lever 45 to the right, as far as it will go in that particular setting of the plate 51. That is indicated in Fig. 3, in which the full line position of the pin 59 is the position for forward sewing, and the dotted line position of the pin 59 is the position for sewing in the reverse direction. Now, the pin 59 projects through an arcuate slot 62, provided in the lower portion of the column 9, for cooperation with the V-notch 58 in the plate 57. There is another arcuate slot 53, concentric to the slot 62 but on a shorter radius, and another pin 64 extends from the lever 45 through this slot for connection to one end of a coiled tension spring 65, that is anchored at its other end inside the column 9 and tends normally to urge the lever 45 in a counter-clockwise direction, so as to keep the pin 59 normally in engagement with the left side of the notch 58 in the plate 51. It would be clear, therefore, that when the operator has set the machine for say 15 stitches per inch, the spring 55 acts to maintain that setting, but is yieldable to permit the operator to swing the lever 45 to the right as far as the notch 58 will permit in that particular setting of the plate 57, for sewing in the reverse direction, and such reverse sewing can be continued so long as the lever 45 is in that position. As soon as the lever 45 is released, it will automatically return under action of the spring 65 to its normal position for forward sewing. The plate 51 is operable in a guide-way provided therefor between the front wall of column 9 and a cross-bar 66, provided inside the column, and, if desired, there may be sufficient frictional resistance to sliding movement of plate 51 in this guide-way to maintain the plate in a given setting. On the other hand, the lever 61 which is pivoted on a cross-pin (i8 inside the column 9 and has a pin and slot connection with the plate 57, as indicated at 59, may have any suitable or preferred means for detachably securing the same in adjusted position, as, for example, the lever 67 may be biased toward the right side of the slot Ill in the front Wall of the column through which the lever projects for operation, and a tooth H may be provided on the right side of the lever to enter any one of the series of serrations 1?, provided in the right side of the slot 70.

In operation, when the operator wants to change the setting of the machine for a different number of stitches per inch she first raises the lever 61 so as to raise the plate 51 to an out of the way position in relation to the stop pin 59, and then she grasps the knob 60, which has meanwhile moved to the left end of the slot 62, under action of the spring 55, and swings the lever 45 to the point where the pointer 55 indi- 6 cates on the scale 56 the desired number of stitches per inch. Then, while still holding the knob 60 in that position of adjustment, she moves the lever 61 downwardly, as far as the pin 59 and the notch 58 in the plate 51 will permit. Then the lever 61 is left in the position and it is obvious that the setting will be maintained until a new adjustment is made, and, as previously described, whatever setting is selected for the number of stitches per inch in forward sewing applies also for sewing in the reverse direction.

It is believed the foregoing description conveys a good understanding of the objects and advantages of my invention. The appended claims have been drawn with a view to covering all legitimate modifications and adaptations.

I claim:

1. In a sewing machine including a driven shaft and a rotary hook driven thereby for cooperation with a needle in the forming of stitch loops, a stitch regulating and reversing mechanism comprising a pair of eccentrics driven by said shaft, a rotatably adjustable diametrically grooved cross-head in spaced relation to the eccentrics, an arm reciprocable by one of said eccentrics carrying a follower pin slidable in the groove of said cross-head, an elongated member reciprocable up and down by the other eccentric and adapted to operate cloth feed dogs accordingly, a pair of substantially parallel arms pivotally mounted in spaced relation adjacent the ends of said elongated member and loosely pivotally connected therewith and adapted to transmit back and forth motion to said member in the oscillation of said parallel arms, and means connected to said follower pin to oscillate said arms.

2. Ina sewing machine, a drive shaft, a feed mechanism comprising a pair of laterally spaced substantially parallel oscillatable arms and a feed dog and a carriage therefor operatively connected to one end of said arms and adapted to be given back and forth movement along substantially parallel lines in addition to up and down movement at the opposite extremes of its back and forth movement, two eccentrics turning with the drive shaft, one of which operates the feed dog carriage in its up and down movement with constant rise, a reversible feed controlling cam having a diametrically extending slot, means for rotatably adjusting said cam, and means operable by the other eccentric relative to the slot in said cam to actuate the feed mechanism, said feed dog and carriage being given back and forth movement of variable extent depending upon the rotary adjustment of said feed controlling cam.

3. In a sewing machine, a rotary hook shaft, a rotary hook on the outer end thereof, a second shaft below and in close proximity to the rotary hook shaft, a feed controlling cam on the outer end thereof, means connected to said second shaft to adjust said cam rotatively, a pair of eccentrics on said rotary hook shaft behind the rotary hook but directly over said cam, and a feed mechanism enclosing said eccentrics and including a feed dog and a carriage therefor, said carriage being operable by one of said eccentrics with constant rise regardless of the rotary adjustment of said cam, said mechanism being operable otherwise by the other eccentric for back and forth movement of the dog in accordance with the adjustment of said cam. 4. A sewing machine as set forth in claim 3, wherein said feed mechanism includes parallel levers arranged to be oscillated and having pin and slot connections with the opposite ends of said reed dOg carriage whereby to give lparallelogram movement to said dog in which the cloth feed movement is always substantially parallel to the cloth plate of the machine regardless of the rotary adjustment of said cam 'for forward or reverse sewing.

5. In a sewing machine including a hollow column, a feed controlling cam, and a shaft for rotatably adjusting the same, a stitch regulating and reversing mechanism includin a manually oscillatable lever pivotally mounted on said column and operatively connected with said shaft to adjust the same, a stop pin on said lever, a stopplate having a V-notch therein'arranged to be engaged by the pin'at the opposite limits of movement of said lever, and manually adjustable means 'for adjusting said platetoward and away from the pivot of said lever to increase or decrease the latitude of movement of said lever.

'6. A sewing machine as set forth in claim'5, including spring means normally urging said lever to move'in one direction, whereby to hold said cam normally in forward feed position.

'7. A sewing machine as set forth in claim5, including a scale onthe'outsideof said column relativeto which said leveris movable, said lever having a pointer thereon to cooperate with said scale,-said scale being graduated in stitches per inch in both directions from a zero point for forward and reverse sewing, and said stop plate being disposed with the middle of the V-notch in vertical alignment with the-zero point of said scale.

'8. In a sewing machine including a hollow column, a feed 'controlling'cam, and a shaft for rotatably adjusting the same, a stitch regulating and reversing mechanism inoludinga manually oscillatable lever pivotally mounted on saidcolumn and operatively connected with said shaft to adjust the same, a stopppin on said lever, a stop plate having a V-notch therein arranged to be engaged by'the pin-at the opposite limits of movement of said lever, manually adjustable meansfor adjusting said plate toward and away from the pivot of said lever to increase or decreas'e the latitude of movement of said lever, and a scale on the outside of said column relative to which said lever is movable, said lever having a pointer thereon to cooperate with said-scale, said scale being graduated'in stitches per inch in both directions from a zero point for forward and reverse sewing, and said stop plate being disposed with the middle of the V-notch invertical alignment with the zero point of saidscale, said columnhaving an arcuate slot provided therein through whichsaidstoppin projects, and said stop'plate'being disposed inside said column'with the 'V-notch normally in register with-the slot for cooperation with said pin.

9.111 a sewing machine including a 'hollow column, a feed "controlling cam,' and a shaft-for rotatably adjusting the same, a stitch regulating andireversing mechanism including a manually oscillatable lever pivo-tally -mounted on said column and operatively connected with saidshaft to adjust the same, a stop pin on: said lever, a stop plate having a V-notch-therein arranged to be engagedby the pin at the opposite'limits of movement of said lever, manually=-adjustable means foradjustin said plate toward and away from the pivot of saidlever toincreaseordecrease the latitude-oi movement of-said lever, a scale on theoutsideof said columnrelative to which said" lever is movable said -lever' havin'g a pointer thereon to'cooperate with saidscale, said scale being graduated in stitches per-inch in both directions from a zero point for forward and reverse sewing, and said stop plate being disposed with the middle of the V-notch in vertical alignment with the zero point of said scale, said column having an arcuate slot provided therein through 'whichsaid stop pin projects, and said stopplate being disposed inside said column with the 'V-notch normally in register with the slot for cooperation with said pin, and means for releasably securing said plate in different positions ofadjustment.

'-10. In a sewing :machine including a hollow column, a 'feed controlling cam, and a shaft for rotatably adjusting the same, a stitch regulating and "reversing mechanism including a manually oscillatable lever pivotally mounted on said column and operatively connected with said shaft to adjust the same, a stop pin on said lever, a stop plate having a -V--notch therein arranged to beengaged'by the pin at the opposite limits of movement of said lever, manually adjustable means for adjusting said plate toward and away from the*pivot-of said lever to increase or decrease the latitude of movement of said lever, spring means normally urging said lever to move inone direction, whereby to hold said cam normally in iorwardfeed position, and a scale on the outside of said column relative-to which said lever is movable, said lever having a pointer thereon to cooperate with said scale, said scale being graduated in stitches per inch in both directions from a zero point for forward and reverse sewing, and said stop plate being disposed withthe middle of the V-notch in vertical alignment'with the zero point of said scale.

'11, In --a sewing machine including a hollow column, afeed controlling cam, and a shaft for rotatably adjusting the same, a stitch regulating and reversing mechanism including a manually oscillatable lever pivotally mounted-on said column and operatively connected with said shaft to adjust the same, a stop pin on said lever, a stop plate having a V-notch therein arranged to be engaged by the pin at the opposite limits of movement of said lever, manually adjustable means for adjusting said plate toward and away from'thepivot of said lever to increase or decrease the latitude of movement of said lever, spring means normally urging said lever to move inone direction, whereby to hold'said cam normally in forward-feed position, and a scale on the outside of said column relative to which said lever is movable, said lever having a pointer thereon to cooperate with said scale, said scale being'graduated'in stitches per inch in both directionsfor a zero point'for forward and reverse sewing, and said stopplate being disposed with the middle of the -V-notch in vertical alignment Withthe zeropoint of said-scale, said column having an arcuate slot provided therein through which said-stop pin projects, and -said stop plate eing disposed inside said column with the V- notch-normally in register with the slot for cooperation with said pin.

12. In a sewing machine including a hollow column, afeed controlling cam, and a shaft for rotatably-adjusting the same, a stitch regulating andreversing'mechanism including a manually oscillatable lever pivotally mounted on saidcolumn and operatively connected-with said shaft to-a'djust thesame, astop -pin on said lever, a stop platehaving -a-V-n0tch lthereinrarranged to be e ged by thetpinxat the opposite 'limits of movement of said lever, manually adjustable means for adjusting said plate toward and away from the pivot of said lever to increase or decrease the latitude of movement of said lever, spring means normally urging said lever to move in one direction, whereby to hold said cam normally in forward feed position, a scale on the outside of said column relative to which said lever is movable, said lever having a pointer thereon to cooperate with said scale, said scale being graduated in stitches per inch in both directions from a zero point for forward and reverse sewing, and said stop plate being disposed with the middle of the V-notch in vertical alignment with the zero point of said scale, said column having an arcuate slot provided therein through which said stop pin projects, and said stop plate being disposed inside said column With the V-notch normally in register with the slot for cooperation with said pin, and means for releasably securing said plate in different positions of adjustment.

13. In a sewing machine feeding mechanism the combination with a feed dog, of an elongated carriage therefor substantially horizontally disposed, a pair of substantially parallel rocker arms i disposed substantially vertically in spaced relationship and pivotally mounted adjacent the opposite ends of said carriage and having their upper ends slidably pivotally connected to said carriage permitting up and down movement of said carriage relative to said arms while the carriage is reciprocated substantially horizontally along parallel lines in the oscillation of said arms, means for oscillating said arms for forward or reverse sewing, and means for moving said carriage up and down in timed relation with the operation of the last named means.

14. A sewing machine as set forth in claim 13, including a driven shaft carrying two eccentrics, and a follower portion on said carriage the last named means for moving said carriage up and down in timed relation with the operation of the means for oscillating said arms, comprising one of said two eccentrics on the driven shaft operating in the follower portion provided on said carriage whereby said dog is raised the same distance every time, the other eccentric forming a part of the second to the last named means to cause oscillation of said arms.

15. In feeding mechanism for sewing machines, the combination of an upper drive shaft and a lower feed control shaft disposed in closely spaced substantially parallel relation in approximately the same vertical plane, a rotary loop-taker on the drive shaft, a feed-lift eccentric and a feedadvance eccentric fixed side by side on the drive shaft adjacent the loop-taker, a diametrically slotted cam therebeneath onthe end of the feed control shaft, a feed dog operatively associated with the feed-lift eccentric, spaced substantially parallel feed-advance levers oscillatably mounted in fore and aft relation to said feed dog and operatively connected therewith to impart feed movements thereto, and means operatively associated with the feed-advance eccentric so as to be reciprocated in the diametrical slot of the feed control cam and operatively connected with said feed-advance levers so as to oscillate the same through an angularity dependent upon the rotary adjustment of said feed control cam.

' MATTHEW G. IVANDICK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,024,434 Eames Dec. 1'7, 1935 2,058,837 Smith Oct. 27, 1936 Certificate of Correction Patent No. 2,420,480. May 13, 1947. MATTHEW G. IVANDIOK It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Column 8, line 58, claim 11, for the word for after'the syllable rections read from; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 19th day of August, A. D. 1947.

LESLIE FRAZER,

First Assistant Commissioner of Patents. 

